A concatenative language is one where every function has a single argument (a stack) and returns a single value (a new stack). This means that a concatenative language is also a pure functional language. Concatenative languages are very easy to implement and optimize, so I am hoping to reuse Unimperative as a target for Heron.

Development is still in its early stages, but an open-source Unimperative library for C++ is available at Unimperative.com. There is a mailing list at the site for anyone interested in helping out with the design and implementation of the language.

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Christopher Diggins is a software developer and freelance writer. Christopher loves programming, but is eternally frustrated by the shortcomings of modern programming languages. As would any reasonable person in his shoes, he decided to quit his day job to write his own ( www.heron-language.com ). Christopher is the co-author of the C++ Cookbook from O'Reilly. Christopher can be reached through his home page at www.cdiggins.com.